Skip to main content

Table 4 Validation at 12 months using the test and external validation datasets

From: Predicting COPD 1-year mortality using prognostic predictors routinely measured in primary care

  Mean SE 95% CI Mean SE 95% CI
  Test set External validation
Harrell’s C-index 0.794 0.006 0.782–0.807 0.671 0.012 0.647–0.695
D-statistic 1.865 0.048 1.770–1.959 0.983 0.080 0.826–1.141
Calibration slope 0.947 0.024 0.900–0.993 0.544 0.046 0.454–0.635